I tried coping a cart flows step, from one multi site then pasting it to another.

And then I get this prompt:

There has been a critical error on this website.

Learn more about troubleshooting WordPress.

and the flow stops working.

I used both copy paste, and import export, as new and override.

When I copy paste section by section it works. But when I try and copy paste the whole page it doesn't.

I tried with a default template flow, and I got these errors:

Request failed, code: 500
#0 /home/wptemplate/htdocs/www.wptemplate.online/wp-content/plugins/doubly-pro/inc_php/operations.class.php(565): UniteFunctionsDOUBLY::getUrlContents()
#1 /home/wptemplate/htdocs/www.wptemplate.online/wp-content/plugins/doubly-pro/inc_php/operations.class.php(673): Doubly_Operations->pastePostFromData_getZipContent()
#2 /home/wptemplate/htdocs/www.wptemplate.online/wp-content/plugins/doubly-pro/inc_php/actions.class.php(218): Doubly_Operations->pastePostFromData()
#3 /home/wptemplate/htdocs/www.wptemplate.online/wp-content/plugins/doubly-pro/inc_php/admin.class.php(191): Doubly_AjaxActions->onAjaxActions()
#4 /home/wptemplate/htdocs/www.wptemplate.online/wp-includes/class-wp-hook.php(307): Doubly_PluginAdmin->onAjaxActions()
#5 /home/wptemplate/htdocs/www.wptemplate.online/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#6 /home/wptemplate/htdocs/www.wptemplate.online/wp-includes/plugin.php(476): WP_Hook->do_action()
#7 /home/wptemplate/htdocs/www.wptemplate.online/wp-admin/admin-ajax.php(187): do_action()
#8 {main}